E4 Led Guide

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The E4 comes equipped with a single button to support interactions. You can trigger different E4 actions depending on the duration of the button press.

button interaction notes

  • Short press: A short press is a quick click on the button (similar to clicking on a keyboard, trackpad or mouse button).
  • Standard Press: A standard press can be triggered by holding down the button between about one and three seconds.
  • Long Press: A long press can be triggered by holding down the button for more than five seconds.

When the E4 is powered off and disconnected from USB

  • Short press - From the OFF state a short pressure will not result in any output from the E4.
  • Standard press - Power on the E4. Press and hold the button until you see the green status LED switch on indicating that the E4 has entered Standby Mode. As soon as you see the light you can release the button and the normal pressure is completed. The green status LED will pulse while the device is in standby mode. While the Ed is in standby mode you can connect it to a mobile device to enter Streaming Mode (indicated by a blue LED light) or wait for ~60 seconds for the device to enter Recording Mode (indicated by a red LED light).

When the E4 is powered on in Recording Mode

  • During start-up - as the E4 enters recording mode the red LED will pulse for ~20 seconds before going dark.
  • Short Press - create and event mark. The red LED will come on for 1 second indicating the Event Mark has been recorded.
  • Standard Press - You can turn off the E4 with a standard press. As soon as you click the button the led turns on and then off after a second. As soon as the led is off you can release the button. The E4 now turned off.
  • Long Press - device reset. A successful "Reset" is indicated solid white light. NOTE: After a reset the device may need to be connected to USB to re-activate it.

When the E4 is powered on in Streaming Mode

  • During start-up - after the streaming connection is first established the blue LED will pulse for ~20 seconds before going dark.
  • Short Press - create and event mark. The blue LED will come on for 1 second indicating the Event Mark has been recorded.
  • Standard Press - You can turn off the E4 with a standard press. As soon as you click the button the led turns on and then off after a second. As soon as the led is off you can release the button. The E4 should now be powered down.
  • Long Press - device reset. A successful "Reset" is indicated solid white light. NOTE: After a reset the device may need to be connected to USB to re-activate it.

When you power on the E4, make sure that the E4 starts in Standby Mode flashing green, which means that it is ready for use.

Error states are indicated by the following color combinations:

  • Flashing green and red indicates that the E4's memory is full or the clock is unset preventing you from operating the device in Memory Mode. You can still connect to the E4 from the Empatica Realtime app on your smartphone/tablet. 
  • Flashing green and yellow LED lights indicate that the E4 has a low battery and should be charged soon. 

USB Connections

  • Connecting E4 to E4 Manager via the USB charging cradle - the device enters Standby Mode (green LED); if there is data in memory the data transfer will commence indicated by alternating yellow and purple LED lights.
  • The E4 may alternate flashing green and yellow after connecting it to a USB power source when attempting to transfer data. Charge the E4 for several minutes, disconnect, and reconnect to initiate the transfer of data.
  • Charging the E4 - The E4 can be charged by most powered USB connections (5V). When connected, the yellow LED light indicates that the E4 is charging. The yellow light stays on until the battery is charged.

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